Phonograph



(No Model.) v

' T. A. EDISON.

PHONQGRAIH. v

No. 406,570. Patented July 9, 1889.

RL 0 Q V m m ATTORNEYS N. PETERS. Photo-Ullwgrapher. wmmm n. c

UNITED STATES PATENT OFFICE.

THOMAS A. EDISON, OF LLEWELLYN PARK, NEIV JER SEY.

PHONOGRAPH. l

SPECIFICATION forming part of Letters Patent No. 406,570, dated. July 9,1889.

Application filed February 11,1889. $e1ial No. 299,452. [No model.)

To all whom it may concern:

Be it known that I, THOMAS A EDISON, a citizen of the United States,residing at Llewellyn Park, in the county of Essex and State of NewJersey, have invented a certain new and useful Improvement inPhonographs, (Case No. 820,) of which the followingis a specification.

The object I have in View is to prevent wholly or in a measure theeffect of the electrification of the chips which are produced by turningoff the surface of the phonogramblanks. I use for my blanks a hardcompositionsuch as a hard metallic soap-and this composition, as well asall hard wax compositions, produces in turning chips which have ahighdegree of electrification, and which adhere to the cylinder and to thecuttingknife, as well as to the point of the recorder, and injure thesurface of the record produced by the recorder, the recording beingperformed at the same time that the surface is turned 0%, as has beenmade clear by applications for patent'already filed by me. I have foundthat the evil effects of the electrification of the chips will be doneaway with in a measure by breaking up or powdering the chips as they areproduced, and this I accomplish by providing the turning-off knife witha shoe, which breaks or powders the chips into small pieces as they risefrom the cutting-edge, of the knife.

In the accompanying drawings, forming a part hereof, Figure 1 is atopview of thespectacle-frame of my phonograph, showing the cutting-knifewith breaking-shoe in position for operation. Fig. 2 is a side view ofthe knife, and Fig. 3 is an end view of the knife.

A is the spectacle-frame, in the eye a of which is placed the recorder.The turningolf tool B is secured rigidly to the spectacle frame andprojects toward the center of the eye a and downwardly toward thesurface of the phonogram blank. The edge I) of the knife bears obliquelyupon the surface of the blank and acts as a turning-tool for turning oifthe surface of the blank,producing achip of the material of thephonogram-blank, as will be well understood. The breaking-shoe O is aplate which crosses the end of the knife above the cutting-edge b, andis bent at right angles, extending along one side of the knife, to whichit is secured by means of a slot and a set-screw c, which permit properadjustment of the breaking-shoe with relation to the cutting-edge b. Theshoe G, being directly above the cutting-edge and projecting beyond it,forms a shoulder, against which the chips strike as they rise from thecuttingedge, and, the material being brittle, the cffeet is to powder orbreak the chips into small THOMAS A. EDISON.

' IVitnesses:

W. PELZER, D. H. DRISCOLL.

